Magnetically modified biochar for organic xenobiotics removal

Area of Science:

• Environmental Science
• Materials Science
• Chemistry

Background:

• Biochar is widely produced and has potential applications beyond agriculture, including as a biosorbent.
• Efficient removal of xenobiotics from water is crucial for environmental protection.

Purpose of the Study:

• To develop a magnetically responsive biocomposite material from biochar for efficient xenobiotic removal.
• To investigate the adsorption of water-soluble dyes using magnetic biochar as an adsorbent.

Main Methods:

• Biochar was modified with microwave-synthesized magnetic iron oxide nanoparticles.
• Magnetic separation was employed for easy recovery of the adsorbent.
• Adsorption experiments were conducted using five different water-soluble dyes.

Main Results:

• The magnetic biochar composite demonstrated effective removal of water-soluble dyes.
• Adsorption followed Langmuir isotherm and pseudo-second-order kinetic models.
• Maximum adsorption capacity reached 137 mg/g for Bismarck brown Y.
• Thermodynamic studies indicated spontaneous and endothermic adsorption processes.

Conclusions:

• Simple magnetic modification of biochar creates a promising, inexpensive adsorbent.
• The magnetic biochar composite is suitable for the removal of selected xenobiotics, particularly water-soluble dyes.
• This material offers an efficient and easily separable solution for water remediation.